Sergent Zaba here, but I am no use to you as I don't have Nvidia card/s or drivers.
Others will be on parade soon now FP has sounded "Reveille" 
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Yes, your GPU is too old and is no longer supported in the new drivers, but!
First, look at your screenshot please.
AT the lower half of the list, you will see Nvidia 340 PROPRIETARY, I need you to select that one, wait for the lengthy install to finish, then when its done, restart.
Report back and let us know how it went.
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After that, it didn't boot anymore. I reinstalled os, dear guru. For third time in 2 days...
ok? i hope it works
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
nvidia-driver-460 : Depends: libnvidia-gl-460 (= 460.91.03-0ubuntu0.20.04.1) but it is not going to be installed
Depends: libnvidia-extra-460 (= 460.91.03-0ubuntu0.20.04.1) but it is not going to be installed
Depends: nvidia-compute-utils-460 (= 460.91.03-0ubuntu0.20.04.1) but it is not going to be installed
Depends: nvidia-utils-460 (= 460.91.03-0ubuntu0.20.04.1) but it is not going to be installed
Depends: xserver-xorg-video-nvidia-460 (= 460.91.03-0ubuntu0.20.04.1) but it is not going to be installed
Depends: libnvidia-cfg1-460 (= 460.91.03-0ubuntu0.20.04.1) but it is not going to be installed
Depends: libnvidia-ifr1-460 (= 460.91.03-0ubuntu0.20.04.1) but it is not going to be installed
Recommends: libnvidia-ifr1-460:i386 (= 460.91.03-0ubuntu0.20.04.1)
Recommends: libnvidia-gl-460:i386 (= 460.91.03-0ubuntu0.20.04.1)
E: Unable to correct problems, you have held broken packages.
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I am so sorry to hear about this, I really fear your GPU is too old, that there is no support anymore in the kernel and or the current drivers. This might be a case of, kernel and driver must both match.
Hmm, I guess you could also try other distro's, some people are forced to do that. Maybe OS 15.3 LITE? Although, OS 16 LITE will soon be released hopefully in these next coming months, so maybe wait on that?
IDK, I am kind of at a lost at this point, sorry.
MXLinux uses 4.19 kernel (Old stable).
It is worth a try.
Be sure to select the top one in this page:
https://mxlinux.org/download-links/
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Please run
sudo apt remove --purge nvidia-driver-460
Well, the issue was resolved even before you answered the question. Since I had a timeshift backup, I took a leap of faith and installed nvidia-driver-460. Now it's working fine and nvidia-smi shows GPU usage.
Haha 
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Not needed. It won't startup and I re-re-re-re-reinstalled
It's the same thing that using zorin for everything and ubuntu for gaming.
I think i'll keep this.
Thanks really you guys for the help
if i downgrade the kernel? 
I think the difference between you and @capriciousduck is the vintage of the graphics cards.
@capriciousduck has GeForce 840M which is still supported by NVidia.
You have GeForce 310M which is no longer supported.
That is why I suggested you to try other Debian based distribution which still uses old stable 4,19 kernel.
You have to find our how far you can downgrade.
I do not think it is possible to downgrade to 4 series kernels if you want to use Zorin.
let's download mx linux!
the blazing fast wifi
but, for everyday tasks, i'll use zorin forever. It's magic
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You know that you can easily dual-boot MX and Zorin.
It is way easier than dual-boot Linux with Windows.
Windows think it is the only OS under the Sun and has this tendency to overwrite the boot sector for our headache.
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You have a thing that i like. You can say most important things of life in a couple of words.
PS:Windows 10 is garbage
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My english is a mess. Cause I'm Italian...(like pizza!)
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Save your words till you see Windows 11 in real.
I am running it on a 10 years old unsupported laptop out of curiosity and to prove that I can outsmart MS's hardware compatibility check
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I am Japanese ...(like Sushi) 
